I need a new loupe for evalutation my film on a light table. I'm doing 5x4 work, so need something in the 10x or 12x range. I'd like it to be focusable so I can use it with my glasses on. I'd like it to be fairly well corrected so I don't get a lot of color fringing and distortion - my primary use of the loupe is to check for sharpness around the film.
Anyone have a loupe to recommend? Pros and cons of various loupes also welcome.